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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - shared_ptr<T[]> doesn't work as c++17 says it should."
href="https://bugs.llvm.org/show_bug.cgi?id=43470">43470</a>
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<th>Summary</th>
<td>shared_ptr<T[]> doesn't work as c++17 says it should.
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jorg.brown@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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</tr></table>
<p>
<div>
<pre>Consider this simple code:
#include <memory>
const uint32_t* start(std::shared_ptr<const uint32_t[]> smart_array) {
return smart_array.get();
}
This compiles when using libstdc++ : <a href="https://godbolt.org/z/cKHZnl">https://godbolt.org/z/cKHZnl</a>
But not under libc++ : <a href="https://godbolt.org/z/pDGSS5">https://godbolt.org/z/pDGSS5</a>
The error I get is:
cannot initialize return object of type 'const uint32_t *' (aka 'const unsigned
int *') with an rvalue of type 'std::__1::shared_ptr<unsigned int
const[]>::element_type *' (aka 'unsigned int const (*)[]')
return smart_array.get();
^~~~~~~~~~~~~~~~~
And speaking of element_type, that may be the fundamental underlying problem.
In C++17, the type referred to by shared_ptr<T>::element_type changed from:
T
to:
std::remove_extent_t<T></pre>
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